As Hurricane Isaac made landfall in Louisiana near the Mississippi Delta (outlined in black along the top of the images) NOAA P-3 missions collected airborne Doppler radar data to use in initializing and evaluating model guidance. Included here you see images of the horizontal winds within the inner core of Hurricane Isaac sampled from the tail Doppler radar on the P-3 late on 28 August 2012. These images are at three altitudes, 1 km, 3 km, and 6 km, using a composite of winds from four legs oriented north-south, east-west, southwest-northeast, and northwest-southeast. Also plotted on the 1-km altitude analysis are the locations of dropsondes deployed (plotted using standard station symbols). Isaac’s circulation is much more organized than in the previous mission, with a clear circulation center at all altitudes shown, with a slight asymmetry with the strongest winds north and east of the circulation center. This asymmetry increases with increasing altitude, but it is not as pronounced in the previous mission. The strongest winds at all altitudes shown are above hurricane force and the radius of maximum winds is 30 nm. The circulation center is aligned at all altitudes shown, suggesting that the southerly shear Isaac is embedded in diminished significantly.
All the Isaac radar composites at 0.5-km height resolution are available at http://www.aoml.noaa.gov/hrd/Storm_pages/isaac2012/radar.html.